Principle and application of the hottest color las

The principle and application of color laser printer

understanding the principle of black-and-white laser printer is the basis of understanding color printing. Several image transformations can be used to explain its implementation process

original bitmap. The raster image processor of the laser printer changes the printed page into a bitmap, and then converts it into an electrical signal and sends it to the laser scanning unit

bitmap variable charge "negative image" in the laser scanning unit, the image points on the page bitmap are converted into laser signals and transmitted to the imaging drum. Corresponding to each pixel point in the bitmap, the laser beam is emitted when there is a pixel value, and is not emitted when there is no value. When the laser is emitted, a small irradiation point is generated on the imaging drum. The imaging drum is charged in advance. The points irradiated by the laser beam will be discharged, and the points not irradiated will still be charged. Through this process, the page bitmap will be converted into the charge "negative image" on the imaging drum

the "negative image" of charge becomes the "positive image" of toner. The toner has the same property as the charge on the imaging drum. The imaging drum rotates. When the "negative image" of charge passes through the developing roller, the discharged point will absorb the charged toner according to local conditions, while the non discharged point will not absorb the toner due to the same repulsion, so the "negative image" of charge will become the "positive image" of toner

the toner "positive image" turns into a bitmap on paper, and the transfer drum rotates with the imaging drum. When the charged paper passes through the transfer drum, the toner is adsorbed on the paper to become a printed image. Because the toner is easy to fall off, the printing paper also needs to pass through a heating roller to make the toner closely adsorb on the paper

since the color laser printer uses four-color toner, the above generation steps of charge "negative image" and toner "positive image" should be repeated four times, each time different colors of toner are adsorbed, and finally four-color images of cyan, magenta, yellow and black will be formed on the transfer drum. It is precisely because the color laser printer has a step of repeating four times that the speed of color printing is significantly slower than that of black-and-white printing

the latest color laser printing technology is the so-called "one-time imaging" technology. The key to this technology is to make the laser light-emitting tube small enough to put four light-emitting tubes corresponding to four colors at the position of an existing light-emitting tube. At present, the cost of this process is too high, so the "one-time imaging" color laser printer is not affordable for ordinary users, but there is no doubt that this is the future development direction

TV and movies synthesize colors through self illumination. The synthesis principle is called "addition principle". The three primary colors are red, green and blue, and the auxiliary color is "white". Printing, dyeing and coating form color by absorbing some light, so its law is called "subtraction principle", the ternary color is green, pinkish and yellow, and the auxiliary color is "black"

how is the color of color laser printer synthesized? Take HP technology as an example. Imageret2400 color layering technology is adopted by HP. If the basic resolution of printing is determined to be 600dpi, the image with 600dpi resolution can be calculated, and the center distance between pixels is 42 microns

HP uses ultraprecise ultra-fine toner with a diameter of 5 microns, which can actually achieve 2400dpi effect. The center distance between pixels is about 10 microns at 2400dpi resolution. In other words, if the final color printing result is a pixel resolution of 600dpi, then 16 can be used on a pixel point × 16 green, including a disposable hamburger box, 3 Meiji boxes or food containers for fruits, vegetables, desserts and ice cream, four kinds of yellow and black toner particles plus blank space to modulate the color of the pixel. Because the human eye can no longer distinguish these subtle color particles, what the human eye sees is the total effect after color mixing

how many colors can this technology provide? The calculation method is that the warranty period of a Jinan Ruima electronic universal experimental machine in the arrangement and combination is two years. That is, from the date of acceptance, calculate a classic example: an infinite number of small balls with five colors of green, product, yellow, black and white are packed in five jars. Now feel 16 small balls randomly and put them into an empty jar. How many possible results will you touch in total? The calculated value is the number of colors that imageret2400 technology can theoretically achieve. According to the manufacturer, there are millions of colors

if the diameter of carbon particles reaches 5 nm according to the current processing level of nano materials, then the existing 5 micron carbon particles can be separated 1000 times along the diameter. You can boldly imagine the prospect of color technology development of laser printers in theory. Of course, when the particles are fine to a certain extent, it has completely lost the significance of continuing to be fine for human eye recognition

the price of color laser printer is a little high for ordinary household users. Besides, the manufacturer may not have the intention to sell to household users at present. Then, what departments or occasions can become a part of the color laser printer first

as mentioned at the beginning of this article, there is no reason to use color laser printers, because the world is inherently color, and we all need laser color printing, a high-end output method. However, in terms of current social consumption level, only some people can use color laser printers first

1. It cannot be said that a color laser printer can determine the success or failure of a business activity, but a vivid and creative copy may become an important weight to win a contract

if there is only an occasional piece of material, you can take it to the print service on the street to print; If there is only a small amount of material, you can buy a color inkjet printer to print; If it is a department or enterprise with scale, strength, attention to its own modern image, and frequent printing business, then this color laser printer should be a must

2. If there is a certain amount of printing, the cost of laser color printing will be much lower than that of inkjet printing, which is obviously suitable for commercial typing and copying service, advertising and design departments. Including all kinds of self-employed people who print business cards and cards, it is obviously also suitable to use color laser printers. The cost of printing a box of real color business cards should be solved by 7 yuan, and there is still half the profit of selling a box of 15 yuan

3. Small batch color printing business

the color laser printer undertakes the small batch color printing work, which is fast and simple, and the overall cost is also lower. Color laser printer developers have been interested in occupying this application field

4. Government or military departments

these departments generally solve the purchase funds of color laser printers should not be a problem. These departments may regularly upload and distribute a number of more than a dozen or dozens of red headed documents. Using color laser printers, there is no need to apply specially printed document paper. Printing documents can be fast, convenient and accurate. Military departments should often use color maps and plotting, and the use of color laser printers is the most convenient

color laser printing is not a ship whose mast has been seen on the sea, but a passenger ship that has been anchored at the dock waiting to anchor. What needs to be done is to buy a ticket that is not too low at present. (end)